Choke-coil amplification unit



Jan. 25,1927. 1,615,224

E. E. HILER CHOKE COIL MPLIF'ICATION UNIT Filed April 3o, 192e A TTORNEYS.

Patented Jan. 25, 1927.

.j Ultl'lh TATES EDWARD E. HILER, OF BLOOMIELD, NEW JERSEY.

CI-IOKE-COIL AMPLFICATION UNIT.

Application filed April 30, 1926.

This invention relates to improvements in choke-coil amplification units for use in radio signal amplifying circuits; and the invention has reference to a simplified construction and arrangement of choke-coil units of the general kind and type shown in my United StatesLetters Patent No. 1,589,-

692, dated June 22, 1926.

This invention has for its principal object l0 to provide a simplified arrangement of, choke-coils and condenser in an open frame assembly suitable for quick and easy mounting or attachment directly upon a' main panel, baseer other permanent member of a radio apparatus. The novel arrangement and assembly of the choke-coil unit lcontemplated by this invention is relatively inexpensive, and yet compact, durable and strong.

The present invention is clearly illustrated inthe accompanying drawings, in which Figure 1 is a front elevation of the chokecoil unit in attached relation to a panel or other supporting structure; Figure 2 is a top plan view of the same; and Figure 8 is a sectional view, taken on line 8-'3 in Figure 2.

Similar characters of reference are employed in all of the aforesaid views, to indicate corresponding parts. p

The reference character 4 indicates a laminated metallic core made of annealed carbon sheet steel substantially in the form of a ligure 8 so as to provide outer lateral members 5 in properly spaced relation to an intermediate lateral member 6. Mounted on one outer lateral member 5 of the core 4 is one choke coil 7 and, in like manner, mounted on the other outerl lateral member 5 of the core 4 is another choke coil 8. This arrangement interposes between the choke coils 7 and 8 the, intermediate lateral member 6 of the core 4, thus assuring a proper magnetic circuit for each coil without intervening air gap. y

Extending through the outlying corner portions of the core 4 are supporting legs or rods 9, the respective ends of which project beyond each face of the core. The rearward ends of said legs or rods 9 are screw threaded to receive stop-nuts 10, which abut the rearward face of the core 4 and prevent displacement of the core and its coils, as assembled and supported on said legs or rods 9, in a rearward direction.

Telescopically fitted over the forward end portions of said legs or rods 9 are spacing Serial No. 105,757.

sleeves 11 for supporting a face plate 12 on said legs or rods 9 ln outwardly spaced relation. tosaid core and its coils. 'This face plate is preferably made of a suitable rigid insulation material, and serves to supporta plurality of binding posts or similar electrical termnal Contact means, for purposes subsequently described.

In practice the legs or rods 9 are preferably provided at their outer ends with heads 18, which abut against the outer face of the face plate 12 and thus retain the latter against outward displacement from the said legs or rods. Y

- Disposed between the faceplate 12 and the choke-coils 7 and 8, so as to lie intermediate the sleeves 11 on the legs or rods 9 at the respective outer ends of the core 4, is a coupling grid condenser element 14 provided with terminal projections 15 and 16 respec tively.V of opposite polarity. As thus assembled, the condenser 14 is conveniently arranged for electrical connection between the output side or plate of one amplifying vacuum tube and the grid of a succeeding am plifying vacuum tube, when the complete choke coil .unit is connected in a radio receiving circuit. Y l

Connected with and supported by said faceplate is a battery terminal connection or binding post B, a lament terminal connection or binding post F, a plate terminal connection or binding post P, anda grid terminal connection or binding post Gr, each respectively provided at their inner ends, beneath the face plate 12, with terminal lugs b, f, y? and g. To the terminal lug b is connected one end 7 of the choke-coil 7, the opposite end 7" of which is connected with the terminal projecton 15 of the condenser 14, and thence through a wire connection 17 is connected with the terminal lug p, thus connecting both the condenser 1.4 and chokecoil 7 on the plate side of a stage in an am plifying circuit. To the terminal lug f is connected one end 8 of the 'choke-coil 8, the opposite end 8" of which'is connected with the terminal projection 16 of the condenser 14, and thence through a wire connection 18 is connected with the terminal lug g, thus connecting both the condenser 14 and chokecoil 8 on the grid side of a stage in an amplifyi ng circuit.

interposed between the condenser 14 and the inner ends of the terminal connections or binding posts of the face plate 12 is a shieldf plate 19'rnade` of a= suitable insulation material.

In the choke-coil unit, as thus constructed and assembled, thel rearward free ends of the legs or rods 9 project or extend freely beyond the rearward side or the choke-coils 'l' and 8, consequently when it is desired to mount the unit upon a main panel, base or other iXed member of a radio apparatus,l as e: g. the panel: 19, the free ends oisaidt legs or rods 9 are projected through holes in4 said panell, spaced to correspond to thev positions of saidY legs or rods 9, until the choke-coils 7 and 8 abut against the panel surface. Fastening` nuts 20 are thereupon applied on the projecting portions of the legs or rods 9 to abut against the opposite surface of the panelL 19, thus firmly securing the` unit in mounted andI` supported' relation to the panel.

From the above descriptionV it will be apparent that a very simple andv inexpensive form of choke-coil unit is provided, which mayl be quickly, easily andI firmly secured in operative relation to a radio apparatus; and at the same time the parts of the unit are compactly and strongly assembled, and. have been reduced toy a minimum in weight.

It will be understood that although the above description sets forth one satisfactory form of unit assemblyk and arrangement, various modifications and detail changes may be made in such assemblyy and arrangement within the scope of the claims here unto appended. Hence, I do not limit mjself to the exact arrangement and construe tion of the parts as above described nor do Il limit myself to the exact details of the construction thereof as illustrated in the accompanying drawings..

I claims- 1. A unitary device of the kind described, comprising a laminate metallic core substantially in the form of ak figure 8, a pair of choke-coils mounted respectively on the outer lateral members of said core with the intermediate lateral member of the latter disposed therebetweem. a face-plate,` rods extending through said core and face-plate to connect the same in assembled relation, means for retaining said coreand face-plate against displacement from said" rods with the latter in spaced relation'from the former, and. externalV circuit connections carried by said face-plate betweenA certain ot' which said choke-coils are electrically connected.

2. A unitary device of the kind described, comprisinga laminate core substantially in the form of a iigure 8, a pair of choke-coils mounted respectively on the outer lateral members of said core with the intermediate lateral memberl of the latter disposed between said choke-coils, supporting rods eX- tending through the corner portions of said core, the rearward ends ot said rodsbeing threaded, stop nuts on said threaded ends to abut said core and position the same on said rods, a tace plate supported on the forward' ends ot said rods, spacingsleeves ou said rods intermediate said tace plate and` core, external circuit connection carried by. said lace plate between certain oli which said choke-coils areL electrically connected. the rearward free ends ot said rods being adapted for extension through a support, a: fastening` means 'for retaining said rods inl connected relation to said support.

3. A unitary device of the kind described, comprising a laminate core substantially in: the form `ot a figure 8, a pair of choke-coils mounted respectively on the outer lateral members ot said core with the intermediate lateral member of the latter disposed betweenl said choke-coils, support-ingl rods extending through the corner portions oil.f said core, the rearward ends of said rods being threaded, stopr nuts on said threaded? ends te4 abut said core and positionv the saine on said rods, a tace plate supported on the forward ends otv said rods, spacingy sleeves on said rods intermediate said face plate and core, external circuit connections carried bvr said lacel plate between certain otl which said choke-coils are electrically connected, ai condenser element disposed intermediate said choke-coils and said :tace plate and retained against sidewise displacement by saidf rod enclosing spacing sleeves, said condenser being electricallyv connected between certain ot said circuit connections carried by said face plate, the rearward tree ends ot said rods being adapted for extension through a support, and fastening means for retaining said rods in connected relation tol said support.

In testimony, that I claim the invention set forth above I have hereunto set my hand this 24th day of April, 1926.

EDWARD E. HILER'. 

